| 摘要 |
<p>An elastic wave device according to the present invention includes a piezoelectric substrate (14), a comb-shaped electrode (13) arranged on the piezoelectric substrate (14), and a SiOlayer (12) formed so as to cover the electrode (13). The elastic wave device further includes a displacement control layer (11) arranged on the SiOlayer (12). The displacement control layer (11) is made of a material having a lower sound velocity than that of the SiOlayer (12). With this structure, an unnecessary wave can be suppressed and temperature characteristics can be improved. In addition, when a communication module or a communication apparatus includes the elastic wave device, the reliability can be improved.</p> |
